Bonsoir pouvez vous m'aidez car je ne comprend pas trop merci ! A = 3 (x + 6) B = 5(6-y) C = 7(2z - 3) D = -8(9 - 7x) E = -8z('-z) F = 3y(-4+6y)

A = 3 (x + 6)
= 3 * x + 3 * 6
= 3x + 18

B = 5(6-y)
= 5 * 6 + 5 * (-y)
= 30 - 5y

C = 7(2z - 3) 
= 7 * 2z + 7 * (-3)
= 14z - 21

D = -8(9 - 7x)
= -8 * 9 - 8 * (-7x)
= -72 + 56x

E = -8z('-"z)
= -8z * "-" - 8z * z
= 8z - 8z^2

F = 3y(-4+6y)
= 3y * (-4) + 3 * 6y
= -12y + 18y